Blender Arm Twists After Applying Automatic Weight Paint
After searching around some more I found a related post here:
Parenting Armature to Mesh with Automatic Weights deforms Mesh
My issue was that my Pose Position and Rest Position were different, as I showed above, however, I wasn't sure if this was normal or how to go about fixing it. I found from the other post that it's actually the reason for the mesh deforming and the fix is pretty simple. Selecting all of the bones in Pose Mode and pulling up the search bar with f3 you can type &quot;Apply pose as rest pose&quot;, hit enter, and then parent the armature to the mesh and apply automatic weights and the issue with arm twisting is gone. I'm pretty new here but I think this post may be classified as a duplicate now but I found a lot of similar posts unanswered so hopefully, this is helpful to other beginners running into similar troubles.